ECRAN VEILLE LE PLUS BASIC

Commentaire de gagah1 le 03/07/2008 16:23:42

Pas mal pour une source basic.
J'ai modifié la source pour mettre la capture d'écran en image de fond. Et comme les 3 effets ne sont pas symetriques, je ne retient que celui du centre, j'ai remplacé pi par le macro M_PI:


#include <windows.h>
#include <scrnsave.h>
#include <math.h>
#include <commctrl.h>

int delay = 8;
int Rand(int);

int Rand(int nMax)
{
rand()%nMax;
}

BOOL WINAPI ScreenSaverConfigureDialog(HWND hwnd,UINT message, WPARAM wParam,LPARAM lParam)
{
return 0;
}

BOOL WINAPI RegisterDialogClasses(HANDLE hInst)
{
return 1;
}

LRESULT WINAPI ScreenSaverProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static  HBITMAP hbmp;
static RECT scr_dim;
static SIZE size;
static int d=1, c=1, q=3, center_x, center_y, hs, vs;
static int screenWidth, screenHeight;
static long red,green,blue;
HDC    hdc, hdcMem;
int i,x,y;
double xs, ys, temp, k=0.2;

    switch(message)
{
     case WM_CREATE:
            srand(GetTickCount());
     SetTimer(hwnd,1,delay,NULL);
     red=Rand(256);
     green=Rand(256);
     blue=Rand(256);
     hs = GetSystemMetrics(SM_CXSCREEN)/30;
     vs = GetSystemMetrics(SM_CYSCREEN)/30;
    
     screenWidth = GetSystemMetrics(SM_CXSCREEN);
     screenHeight = GetSystemMetrics(SM_CYSCREEN);
            hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
            hdcMem = CreateCompatibleDC(hdc);
    
            hbmp = CreateCompatibleBitmap(hdc, screenWidth, screenHeight );
            SelectObject (hdcMem, hbmp);
            BitBlt(hdcMem, 0, 0, screenWidth, screenHeight, hdc, 0, 0, SRCCOPY);
            
            DeleteDC(hdc);
            DeleteDC(hdcMem);
    
     break;
     case WM_ERASEBKGND:
     hdc = GetDC(hwnd);
     hdcMem = CreateCompatibleDC(hdc);
     GetClientRect(hwnd, &scr_dim);
     center_x = (scr_dim.right - scr_dim.left)/2;
     center_y = (scr_dim.bottom - scr_dim.top)/2;
     SelectObject(hdcMem, hbmp);
            BitBlt(hdc, 0, 0, screenWidth, screenHeight, hdcMem, 0, 0, SRCCOPY);  
    
            DeleteDC(hdcMem);
            ReleaseDC(hwnd, hdc);
     break;
    
     case WM_TIMER:
     hdc = GetDC(hwnd);
     hdcMem = CreateCompatibleDC(hdc);
    
     ys = d/3.0;
     xs = c/3.0;
    
     for(i=0; i<1000; i++)
     {
     temp =(xs + k*sin(ys))*cos(2*M_PI/q) + ys*sin(2*M_PI/q);
     ys = -(xs + k*sin(ys))*sin(2*M_PI/q) + ys*cos(2*M_PI/q);
    
     xs = temp;
     x = (int)(xs * hs);
     y = (int)(ys * vs);
     if(i>10)
                    SetPixel(hdc, x + center_x, center_y - y, RGB(red, green, blue));
     }
     c++;
     if(c>24)
     {
     c=1;
     d++;
     if(d>24)
     {
     d=1;
     q++;
     SelectObject(hdcMem, hbmp);
                    BitBlt(hdc, 0, 0, screenWidth, screenHeight, hdcMem, 0, 0, SRCCOPY);
     red=Rand(256);
     green=Rand(256);
     blue=Rand(256);
     if(q>12)
     {
     q=3;
     c=1;
     d=1;
     }
     }
     }
     DeleteDC(hdcMem);
            ReleaseDC(hwnd,hdc);
     break;
    
        case WM_DESTROY:
     KillTimer(hwnd,1);
     DeleteObject(hbmp);
     break;
    
        default:
     return DefScreenSaverProc(hwnd,message,wParam,lParam);
}
return 0;
}